Yet the incontestable fact remains, unsatisfactory and disquieting, that many murder mysteries have baffled all inquiry, and that the long list of undiscovered crimes is continually receiving mysterious additions. An erroneous impression, however, prevails that such failures are more common in Great Britain than elsewhere. No doubt the British police are greatly handicapped by the law's limitations, which in England always act in protecting the accused. But with all their advantages, the power to make arrests on suspicion, to interrogate the accused parties and force on self-incrimination, the Continental police meet with many rebuffs. Numbers of cases are "classed," as it is officially called in Paris--that is, pigeon-holed for ever and a day, lacking sufficient proofs for trial, and in some instances, indeed, there is no clue whatever. In every country, and in all times, past and present, there have been crimes that defied detection. Feuerbach, in his record of criminal trials in Bavaria, tells, for example, of the unsolved murder mystery of one Rupprecht, a notorious usurer of Munich, who was killed in 1817 in the doorway of a public tavern not fifty yards from his own residence. Yet his murderer was never discovered. The tavern was called the "hell"; it was a place of evil resort, for Rupprecht, a mean, parsimonious old curmudgeon, was fond of low company and spent most of his nights here, swallowing beer and cracking jokes with his friends. One night the landlord, returning from his cellar, heard a voice in the street asking for Rupprecht, and, going up to the drinking saloon, conveyed the message. Rupprecht went down to see his visitor and never returned. Within a minute deep groans were heard as of a person in a fit or in extreme pain. All rushed downstairs and found the old man lying in a pool of blood just inside the front door. There was a gaping wound in his head, but he was not unconscious, and kept repeating, "Wicked rogue! wicked villain! the axe! the axe!" [Illustration: "FOUND THE OLD MAN LYING IN A POOL OF BLOOD."]